# std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::rehash

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< cpp‎ | container‎ | unordered multimap

void rehash( size_type count ); |  | (since C++11)

Changes the number of buckets to a value `n` that is not less than count and satisfies n >= size() / max_load_factor(), then rehashes the container, i.e. puts the elements into appropriate buckets considering that total number of buckets has changed.

### Parameters

count | - | lower bound for the new number of buckets

### Return value

(none)

### Complexity

Average case linear in the size of the container, worst case quadratic.

### Notes

`rehash(0)` may be used to force an unconditional rehash, such as after suspension of automatic rehashing by temporarily increasing max_load_factor().

### See also

reserve | reserves space for at least the specified number of elements and regenerates the hash table (public member function)

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